Added support for proxies to Wrapper.py and updated ChangeLog.txt

[pwin]

I needed to support either not using a proxy for servers within the local network, or external calls through a specific http proxy

[hugovk]

@pwin The tests fail for Python 2.7 and PyPy (also Python 2) because it cannot import jsonlayer

[dayures]

could you provide an example of proxy server to create a test ?

[cottrell]

Hi, I think you are hitting the same problem I hit. There is an import of SPARQLWrapper in the setup.py to get some meta data ... and that means you can not import any libs that are specified in install_requires (jsonlayer or whatever). Just bury them in the functions for now or ask around to fix the setup.py meta import.